

class EventEmitter{
    constructor(){
        this.#listeners = [];
    }
    on(evtName,cb){
       if(typeof  this.#listeners[evtName] ==='undefined'){
        this.#listeners[evtName] = [];
       }

        this.#listeners[evtName].push(cb);
    }
    emit(evtName){
        for(let i=0;i<this.#listeners[evtName].length;i++){
            this.#listeners[evtName][i]();
        }
    }
    #listeners = null;
}

module.exports ={EventEmitter} ;